Technologically challenged - help?

I'm not a tech savvy, I'm happy as long as my computer works, so when something goes wrong, I get frustrated. Since Sunday, I've been having problems with my Facebook page. No updates show, no matter how many times I try. So far, no response from the four reports I've sent to Facebook.
Because I get frustrated, I have no patience. So I try to fix things.
I changed the username ot my page, so now I can't get into the page - it's on and off, sometimes I see it, sometimes I don't.
I also changed the password, and achieved only that now my phone demands I enter it everytime I access Facebook from the mobile.
Any good advice?
Help ...